NTSE Stage 2 SAT 2016 Question Paper

Question : 20 of 100

Marks: +1, -0

The reaction that differs from the rest of the reactions given is :

Solution:

(i)

{CaCO}_{3}{––––––––▸} ↖{∆(\Heating)}+ {CO}_{2}+ {H}_{2} {O}

(ii)

2 {Al}_{2} {O}_{3} {––––––––▸}↖{electrolysis}4 {Al}+3 {O}_{2}

(iii)

2 {NaHCO}_{3} {––––––––▸}↖{∆(\Heating)} {Na}_{2} {CO}_{3}+ {CO}_{2}+ {H}_{2} {O}

(iv)

2 {HgO}{––––––––▸}↖{∆(\Heating)} 2 {Hg}+ {O}_{2}

Equations (i), (iii), (iv) are example of thermal decomposition but equation (ii) is an example of electrolytic decomposition.

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